Improvement in grooying-chisel



iuited tate l n. c. TERWrLLIcnR; or scsANroN., PENNSYLVANA.

Lettlfrs Patent No. IGXQO, dated MarchS, 1870; antcdated February 28,1870.

IMPROVEMENT IN GROOYINGFCHISBL The Schedule' referred to in .theseLetters Patent a'nd maklngpart'of the same.

Be it knownthat I, H'. G. TERWILLIGER, of Scranton, in the county ofLuzerne, andA inV the State of Pennsylvania, have invented certain newand useful Improvements intGrooving-Chisels; and do hereby declare thatthe Yfollowing is a full, clear, and exact description thereof,reference beingr had tothe accompanying drawings adtotl-le letters 'ofreference marked thereon making a part o'f this specification.

i 'lhe nature of my invention consists inthe construction otagrowing-chisel, so that it can be changed or adj usted to any size ofwork required.

In order to enable' others skilled in theart towhieh my inventionappertains to make and use the same, I will now'proceed todescribe itsconstruction and operation, referring to the annexed drawings, whichrepresent an edge view of my jchisel.

A represents the body part ofthe chisel, one side Aof which is extendedand has the cutting-edge a at its outer end, leaving at the base of thisextended' side a square shoulder, on which is placed a number of met-,al plates b b.

On the outer side *of the plates l1 bis placed a chisely blade, B,corresponding in size and shape with the extended side of the mainchisel A, and having a cutting- `edge, a', at its outer end.

The blade B is 'secured by screws d tosthe extended chisel A', saidscrews passing through the plates b b.

apart or closer together, and consequently any-sized grooves may be cutwith the same chisel. y

Having thus fully described myinvention,

What I claim as new, and desire to seeure'by Letters Patent, is y Y,

In combination with a chisel, A, the movable blade B, held at anydesired distance from the chisel A by the plates b b, and held inposition bythe screws d,

substantially as and for the purposesherein set forth.

In testimony. that I claim the foregoing I have hereunto set my handthis 22d day of July, 1869. H..G. TERWILLIGER.

Witnesses:

4'(3. L. EVERT, H. K. Gitaar.

